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The electron gain enthalpies of halogens...

The electron gain enthalpies of halogens are as given below:
`F =- 332, CI =- 349, Br =- 324, I =- 295 kJ mol^(-1)`. The less negative value for F as compared to that of CI is due to:

A

string electron-electron repulsions in the compact 2-p sub shell of F

B

strong electro-electron repulsion in the bigger 3-p sub shell of CI

C

higher electronegativity value of CI

D

higher effective nuclear charge of F

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The correct Answer is:
A
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The amount of energy released when an electron is added to an isolated gaseous atom to produce a monovalent anion is called electron affinity of first electron affinity or electron gain enthalpy. The first electron affinity is given a negative sign as the addition of an electron to a neutral atom is an exoergic process. The addition of electron to A^(-) requires energy to overcome the force of repulsion. Thus, the second electron affinity is an endoergic process. The magnitude of electron affinity depends on a number of factors such as (i) atomic size (ii) effective nuclear charge (iii) screening effects (iv) half and fully filled orbitals and (v) shape of orbital. In general, electron affinity increase as the atomic radii decrease in a period. However, there are exceptions when the atoms have stable configuration. In a group, electron affinity decreases as the size increases. However, the members of 3rd period have somewhat higher values than the members in the 2nd period of the same subgroups. The electron affinities of halogens are: F =- 332, CI =- 349, Br =- 324,I =- 295 kJ mol^(-1) The higher value of CI as compared to that of F^(-) is due to:

The electron affinities of halogens are F=322, Cl=349,Be=324,I=295kJ mol^(-1) . The higher value for Cl as compared to that of F is due to

Few values of enthalpies are given below: O=-141 KJ mol^(-1) F= -328 KJ mol^(-1) S= -200 KJ mol^(-1) Cl= -349 KJ mol^(-1) What do these values show?

The electron gain enthalpy values (in kJ mol^(-1) ) of three halogens, X, Y and Z are respectively -349, -333 and -325. Then X, Y and Z are respectively

Correct order of electron gain enthalpy (Kj/mole) of F, Cl, Br, I

GRB PUBLICATION-PERIODIC TABLE-D. Electron Gain Enthalpy (Electron Affinity)
  1. Considering the elements F,CI,O and S, the correct order of their elec...

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  2. Which will have the maximum value of electron affinity O^(x),O^(y),O^(...

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  3. The electron gain enthalpies of halogens are as given below: F =- 33...

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  4. The formation of the oxide ion O((g))^(2-) requires first an exothermi...

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  5. For the electron affinity of halogens (with -ve sign), which of the fo...

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  6. Which of the following has minimum electron affinity?

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  7. The correct order of electron affinity is:

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  8. Which of the following statement is wrong?

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  9. Which one of the following statements is incorrect?

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  10. Which of the following electron affinity order is incorrect?

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  11. Select the equation is endothermic in nature?

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  12. Which one of the following statements is correct?

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  13. Electron affinity of first element in which of the following pairs is ...

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  14. The least stable in amongst the following is :

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  15. In which of the following arrangements the order is NOT according to t...

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  16. Electron gain enthalpy is positive when:

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  17. Following are the values of the electron gain enthalpy (in kJ mol^(-1)...

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  18. Electron addition would be easier in:

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  19. The electron affinities of N,O,S and CI are such that:

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  20. Consider the following statements. Statement-1: Fluorine does not fo...

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